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\newblock {\em Object Management}, 1990.

\bibitem{clos}
Daniel~G. Bobrow, Linda~G. DeMichiel, Richard~P. Gabriel, Sonya~E. Keene,
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\newblock {Common Lisp object system specification:X3J13 document 88-002R}.
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\bibitem{booch:all}
Grady Booch.
\newblock {\em {Object-Oriented Design With Applications}}.
\newblock Benjamin/Cummings Publishing Company, Inc., 1991.

\bibitem{es90:arm}
Margaret~A. Ellis and Bjarne Stroustrup.
\newblock {\em {The Annotated C++ Reference Manual}}.
\newblock Addison-Wesley, Reading, MA, 1990.
\newblock ISBN 0-201-51459-1.

\bibitem{ghjv94:patterns}
Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides.
\newblock {\em {Design Patterns: Elements of Reusable Object-Oriented
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\newblock Professional Computing Series. Addison-Wesley, Reading, MA, October
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\newblock ISBN 0-201-63361-2.

\bibitem{gb:perspectives}
Ira~P. Goldstein and Dainel~G. Bobrow.
\newblock {Extending Object-Oriented Programming in Smalltalk}.
\newblock In {\em Proceedings of the Lisp Conference}, 1980.
\newblock Stanford, CA.

\bibitem{harrold:testing}
Mary~Jean Harrold, John~D. McGregor, and Kevin~J. Fitzpatrick.
\newblock {Incremental Testing of Object-Oriented Class Structures}.
\newblock In {\em Proceedings of the 14th International Conference on Software
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Richard Helm, Ian~M. Holland, and Dipayan Gangopadhyay.
\newblock {Contracts: Specifying Behavioral Compositions in Object-Oriented
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\newblock In {\em Object-Oriented Programming Systems, Languages and
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\newblock Joint conference ECOOP/OOPSLA.

\bibitem{ian:thesis}
Ian~M. Holland.
\newblock {\em {The design and representation of object-oriented components}}.
\newblock PhD thesis, Northeastern University, 1993.
\newblock http://www.ccs.neu.edu/home/lieber/theses-index.html.

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Ralph~E. Johnson and Brian Foote.
\newblock {Designing reusable classes}.
\newblock {\em Journal of Object-Oriented Programming}, 1(2):22--35, June/July
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\bibitem{amop}
G.~Kiczales, J.~des Rivieres, and D.G. Bobrow.
\newblock {\em The Art of the Metaobject Protocol}.
\newblock The MIT Press, 1991.

\bibitem{karl:demeter}
Karl~J. Lieberherr.
\newblock {\em {Adaptive Object-Oriented Software: The Demeter Method with
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\newblock PWS Publishing Company, Boston, 1996.
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\bibitem{lieber-cun:japan}
Karl~J. Lieberherr and Cun Xiao.
\newblock {Minimizing Dependency on Class Structures with Adaptive Programs}.
\newblock In S.~Nishio and A.~Yonezawa, editors, {\em International Symposium
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\bibitem{lieberman:prototype}
Henry Lieberman.
\newblock {Using Prototypical Objects to Implement Shared Behavior in
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\newblock In {\em Object-Oriented Programming Systems, Languages and
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\bibitem{ll:apmop}
Cristina~Videira Lopes and Karl Lieberherr.
\newblock {A}{P}/{S}++: case-study of a {M}{O}{P} for purposes of software
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\newblock In {\em Reflection '96}, S. Francisco, CA, April 1996.

\bibitem{meyer90:clusters}
Betrand Meyer.
\newblock {Tools for the new culture: Lessons from the design of the Eiffel
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\newblock {\em Communications of the ACM}, 33(9):68--88, September 1990.

\bibitem{java}
Sun Microsystems.
\newblock {\em {The Java Language: A White Paper}}.
\newblock http://www.javasoft.com.

\bibitem{ossher}
Harold Ossher, Matthew Kaplan, William Harrison, Alexander Katz, and Vincent
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\newblock {Subject-oriented composition rules.}
\newblock In {\em Object-Oriented Programming Systems, Languages and
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\bibitem{rumbaugh:oom}
James Rumbaugh, Michael Blaha, William Premerlani, Frederick Eddy, and William
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\newblock {\em {Object-Oriented Modeling and Design}}.
\newblock Prentice Hall, 1991.

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J.J. Schilling and P.F. Sweeny.
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\newblock In {\em Object-Oriented Programming Systems, Languages and
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\bibitem{spl:context}
Linda~M. Seiter, Jens Palsberg, and Karl~J. Lieberherr.
\newblock {Evolution of Object Behavior using Context Relations}.
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\bibitem{smith:reflection}
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\bibitem{taivalsaari:modes}
Antero Taivalsaari.
\newblock {Object Oriented Programming With Modes}.
\newblock {\em Journal of Object-Oriented Programming}, 6(3):25--32, June 1993.

\bibitem{ungar-smith:self-87}
David Ungar and Randall~B. Smith.
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\newblock In {\em Object-Oriented Programming Systems, Languages and
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\bibitem{vlissides:visitor}
John Vlissides.
\newblock {Visiting rights}.
\newblock {\em C++ Report}, September 1995.

\bibitem{vlissides:observer}
John Vlissides.
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\newblock {\em C++ Report}, September 1996.

\bibitem{cun:thesis}
Cun Xiao.
\newblock {\em {Adaptive Software: Automatic Navigation Through Partially
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\newblock PhD thesis, Northeastern University, 1994.
\newblock http://www.ccs.neu.edu/home/lieber/theses-index.html.

\end{thebibliography}